102 



MARINE ANIMALS OF MASSACHUSETTS BAY. 



one is pierced by a small hole through which the 'eggs are 

 passed out, while in the five smaller plates are the eye-specks. 

 The ovaries themselves consist of long pouches or sacs, carried 

 along the inner side of each ambulacrum ; one of these ovarian 

 plates is larger than the others, and forms the madreporic body, 



Fig. 131. 



being pierced with many minute holes ; here, as in the Star-fish, 

 it is placed between two of the ambulacra! rows, and opposite the 

 fifth or odd one. Looked at from the under or the oral side, as 

 seen in Fig. 184, the animal presents the mouth, a circular aper- 

 ture furnished with five teeth in its centre ; these five teeth open- 

 rig. 131. Toxopneustes from above, with all the appendages expanded ; natural size. 



